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Microbial Dynamics of Co- and Separately Entrapped Mixed Cultures of Mesophilic Lactic Acid Bacteria During the Continuous Prefermentation of Milk by Isabelle Sodini; Clair-Yves Boquien; Georges Corrieu; Christophe Lacroix is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

What is Microbial Dynamics of Co- and Separately Entrapped Mixed Cultures of Mesophilic Lactic Acid Bacteria During the Continuous Prefermentation of Milk about?

Four strains of mesophilic lactic acid bacteria were separately or coentrapped in K-carrageenanllocust bean gum gel beads and used for continuous prefermentation of UHT skim milk in a stirred-tank bioreactor. Lactic acid and cell productivities of the immobilized cell bioreactor were particularly high and remarkably stable during eight weeks of continuous milk prefermentation (about 18 g h-'1-t of lactic acid and 4.9 x lOI2 CFU h-r 1-t. respectively, but important variations of the bacterial populations in prefermented milk and gel beads occurred in any case (co-or separate entrapment). The strain Lactococcus lactis subsp. lactis biovar diacetylactis CDIl became dominant, accounting for approx. 90% (released cells) and 78% (immobilized cells) of the total population. Microscopic observations of sections of gels beads showed a progressive destructing of the bead surface with rupture and release of entrapped viable cells from peripheral cavities of the gel. It is believed that these cavities close again after releasing all or part of their cell content, entrapping the different strains of the mixed culture and initiating a new colonization step and a cross-contamination of the beads.

Who reads Microbial Dynamics of Co- and Separately Entrapped Mixed Cultures of Mesophilic Lactic Acid Bacteria During the Continuous Prefermentation of Milk?

Author

Isabelle Sodini; Clair-Yves Boquien; Georges Corrieu; Christophe Lacroix

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0141-0229)

Published

1997

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)